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the answer is a) 10 + p = 12 + 0.5p

Step-by-step explanation: as stated in the problem above, both companies have shipping fees (A's being $10 and B's being $12) these do not change, so a variable is not needed next to those two numbers. That eliminates c and d. You know a is correct because company A charges $1 per pound, not a cent a pound. That's why it is p and not 0.1p. That is why the answer is a. sorry for the wonky explanation </3

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft